铜绿层 tónglǜcéng patina Origin Definitions Defs Strokes Stroke Words Sentences Sents 铜绿 銅綠 tónglǜ verdigris green rust or patina that forms on the surface of copper; it is poisonous and used in making pigments and fireworks; also called 铜锈 tóngxiù层 層 céng noun layer A physical sheet, thickness of material, or stratum covering a surface